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Finding the Fourth Proportional to 100,645.99, 138,863.50 and 66,643.61

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Solution

The fourth proportional to 100,645.99, 138,863.50 and 66,643.61 is: 91,949.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,645.99 : 138,863.50 = 66,643.61 : x
  2. Step 2: Convert to fraction form
    100,645.99/138,863.50 = 66,643.61/x
  3. Step 3: Cross multiply
    100,645.99x = 138,863.50 × 66,643.61
  4. Step 4: Simplify right side
    100,645.99x = 9,254,363,909.70
  5. Step 5: Solve for x
    x = 9,254,363,909.70/100,645.99
  6. Step 6: Final answer
    x = 91,949.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.